Custom Portland Home Additions
Transform your home with an expertly crafted home addition from Lamont Bros.
Why Build a Home Addition in Portland?
In a city known for charming homes and limited lot space, home additions in Portland are a smart way to gain square footage without moving. Whether you need a spacious kitchen expansion, a new primary suite, or want to add a second-story, we can help you grow your home with care and craftsmanship.
At Lamont Bros., we work with the unique challenges of Portland homes—tight footprints, older plumbing and framing, and strict zoning rules. Our team brings experience, precision, and creativity to every addition.
Top reasons Portland homeowners add space:
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Expand without leaving the neighborhood they love
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Make room for a growing family or multigenerational living
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Create a functional home office or guest suite
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Boost property value with smart, high-ROI design
Common Types of Home Additions We Complete:
- Ground Floor Expansions
- Primary Suite Additions
- Second Story Additions
- Kitchen Expansions
Featured Portland Home Addition Projects
How Much Do Home Additions Cost in Portland?
Depending on size and complexity, most home additions in Portland cost between $100,000 and $400,000.
Smaller additions: $100K–$175K
Kitchen or primary suite additions: $175K–$275K
Second-story or large-scale additions: $250K–$400K+
Want a personalized estimate?
The Lamont Bros. Difference
Project Per Superintendent
Your superintendent has one focus – your project is their priority.
Days Average Schedule Variance
Last year we finished projects within two days of the original completion date.
Start-to-Finish Cost Variance
We pride ourselves on providing accurate budgets without surprises, routinely completing projects within 5% of budget.
Portland's Trusted Design-Build Team: 470+ Verified Reviews Since 2008

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